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virtio-pci: move freeze/restore to virtio core 

This is in preparation to extending config changed event handling
in core.
Wrapping these in an API also seems to make for a cleaner code.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Michael S. Tsirkin 2014-10-14 10:40:35 +10:30 committed by Rusty Russell
parent 016c98c6fe
commit c6716bae52
3 changed files with 62 additions and 52 deletions
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54
drivers/virtio/virtio.c
View File

@ -248,6 +248,60 @@ void virtio_config_changed(struct virtio_device *dev)
}
EXPORT_SYMBOL_GPL(virtio_config_changed);
#ifdef CONFIG_PM_SLEEP
int virtio_device_freeze(struct virtio_device *dev)
{
struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
dev->failed = dev->config->get_status(dev) & VIRTIO_CONFIG_S_FAILED;
if (drv && drv->freeze)
return drv->freeze(dev);
return 0;
}
EXPORT_SYMBOL_GPL(virtio_device_freeze);
int virtio_device_restore(struct virtio_device *dev)
{
struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
/* We always start by resetting the device, in case a previous
* driver messed it up. */
dev->config->reset(dev);
/* Acknowledge that we've seen the device. */
add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);
/* Maybe driver failed before freeze.
* Restore the failed status, for debugging. */
if (dev->failed)
add_status(dev, VIRTIO_CONFIG_S_FAILED);
if (!drv)
return 0;
/* We have a driver! */
add_status(dev, VIRTIO_CONFIG_S_DRIVER);
dev->config->finalize_features(dev);
if (drv->restore) {
int ret = drv->restore(dev);
if (ret) {
add_status(dev, VIRTIO_CONFIG_S_FAILED);
return ret;
}
}
/* Finally, tell the device we're all set */
add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
return 0;
}
EXPORT_SYMBOL_GPL(virtio_device_restore);
#endif
static int virtio_init(void)
{
if (bus_register(&virtio_bus) != 0)

54
drivers/virtio/virtio_pci.c
View File

@ -57,9 +57,6 @@ struct virtio_pci_device
/* Vectors allocated, excluding per-vq vectors if any */
unsigned msix_used_vectors;
/* Status saved during hibernate/restore */
u8 saved_status;
/* Whether we have vector per vq */
bool per_vq_vectors;
};
@ -764,16 +761,9 @@ static int virtio_pci_freeze(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
struct virtio_driver *drv;
int ret;
drv = container_of(vp_dev->vdev.dev.driver,
struct virtio_driver, driver);
ret = 0;
vp_dev->saved_status = vp_get_status(&vp_dev->vdev);
if (drv && drv->freeze)
ret = drv->freeze(&vp_dev->vdev);
ret = virtio_device_freeze(&vp_dev->vdev);
if (!ret)
pci_disable_device(pci_dev);
@ -784,54 +774,14 @@ static int virtio_pci_restore(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
struct virtio_driver *drv;
unsigned status = 0;
int ret;
drv = container_of(vp_dev->vdev.dev.driver,
struct virtio_driver, driver);
ret = pci_enable_device(pci_dev);
if (ret)
return ret;
pci_set_master(pci_dev);
/* We always start by resetting the device, in case a previous
* driver messed it up. */
vp_reset(&vp_dev->vdev);
/* Acknowledge that we've seen the device. */
status |= VIRTIO_CONFIG_S_ACKNOWLEDGE;
vp_set_status(&vp_dev->vdev, status);
/* Maybe driver failed before freeze.
* Restore the failed status, for debugging. */
status |= vp_dev->saved_status & VIRTIO_CONFIG_S_FAILED;
vp_set_status(&vp_dev->vdev, status);
if (!drv)
return 0;
/* We have a driver! */
status |= VIRTIO_CONFIG_S_DRIVER;
vp_set_status(&vp_dev->vdev, status);
vp_finalize_features(&vp_dev->vdev);
if (drv->restore) {
ret = drv->restore(&vp_dev->vdev);
if (ret) {
status |= VIRTIO_CONFIG_S_FAILED;
vp_set_status(&vp_dev->vdev, status);
return ret;
}
}
/* Finally, tell the device we're all set */
status |= VIRTIO_CONFIG_S_DRIVER_OK;
vp_set_status(&vp_dev->vdev, status);
return ret;
return virtio_device_restore(&vp_dev->vdev);
}
static const struct dev_pm_ops virtio_pci_pm_ops = {

6
include/linux/virtio.h
View File

@ -78,6 +78,7 @@ bool virtqueue_is_broken(struct virtqueue *vq);
/**
* virtio_device - representation of a device using virtio
* @index: unique position on the virtio bus
* @failed: saved value for CONFIG_S_FAILED bit (for restore)
* @dev: underlying device.
* @id: the device type identification (used to match it with a driver).
* @config: the configuration ops for this device.
@ -88,6 +89,7 @@ bool virtqueue_is_broken(struct virtqueue *vq);
*/
struct virtio_device {
int index;
bool failed;
struct device dev;
struct virtio_device_id id;
const struct virtio_config_ops *config;
@ -109,6 +111,10 @@ void unregister_virtio_device(struct virtio_device *dev);
void virtio_break_device(struct virtio_device *dev);
void virtio_config_changed(struct virtio_device *dev);
#ifdef CONFIG_PM_SLEEP
int virtio_device_freeze(struct virtio_device *dev);
int virtio_device_restore(struct virtio_device *dev);
#endif
/**
* virtio_driver - operations for a virtio I/O driver